Suppose that an economy produces 2,400 units of output, employing 60 units of input, and the price of the input is $30 per unit. The level of productivity in this

Suppose that an economy produces 2,400 units of output, employing 60 units of input, and the price of the input is $30 per unit. The level of productivity in this economy is
A) 20.
B) 30.
C) 40.
D) 50.

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